/Engine/Source/Runtime/MovieScene/Public/EntitySystem/MovieSceneEntitySystem.h
Creates a relationship between the two system types that ensures any systems of type UpstreamSystemType always execute before DownstreamSystemType if they are both present
static void DefineImplicitPrerequisite ( [TSubclassOf](API\Runtime\CoreUObject\Templates\TSubclassOf)< [UMovieSceneEntitySystem](API\Runtime\MovieScene\EntitySystem\UMovieSceneEntitySystem) > UpstreamSystemType, [TSubclassOf](API\Runtime\CoreUObject\Templates\TSubclassOf)< [UMovieSceneEntitySystem](API\Runtime\MovieScene\EntitySystem\UMovieSceneEntitySystem) > DownstreamSystemType )